We needs approx.
Your first step is to write a stoichiometric equation.....this is absolutely vital.
This is a comproportionation reaction, in which nitrogen is simultaneously oxidized (from
And given the clear stoichiometry, each equiv dinitrogen gas corresponds to one equiv of
Now, given the Ideal gas equation, and we may reasonably assume ideality, then
And thus there were about
And thus there were
And we use these data to tell us that
And so we needs
Are you with me? I urge you to go thru the equations yourself, and reproduce it (and you might find an error on my part). Part of the problem is that your question assumed knowledge of data that were not quoted in the question. (These data should have been quoted!).